RT8272
3A, 24V, 1.2MHz Step-Down Converter
General Description
Features
z Wide Operating Input Range : 4.75V to 24V
z Adjustable Output Voltage Range : 0.92V to 15V
z Output Current up to 3A
The RT8272 is a high voltage buck converter that can
support the input voltage range from 4.75V to 24V and the
output current can be up to 3A. Current Mode operation
provides fast transient response and eases loop
stabilization.
z 25μA Low Shutdown Current
z Power MOSFET : 0.1Ω
z High Efficiency up to 95%
The chip provides protection functions such as cycle-by-
cycle current limiting and thermal shutdown protection.
In shutdown mode, the regulator draws 25μA of supply
current. The RT8272 is available in a SOP-8 (Exposed
Pad) surface mount package.
z 1.2MHz Fixed Switching Frequency
z Stable with Low ESR Output Ceramic Capacitors
z Thermal Shutdown Protection
z Cycle-By-Cycle Over Current Protection
z RoHS Compliant and Halogen Free
Ordering Information
RT8272
Applications
z Distributive Power Systems
Package Type
SP : SOP-8 (Exposed Pad-Option 1)
z Battery Charger
z DSL Modems
Lead Plating System
z Pre-regulator for Linear Regulators
G : Green (Halogen Free and Pb Free)
Note :
Pin Configurations
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
(TOP VIEW)
BOOT
VIN
8
7
6
5
SS
2
3
4
EN
GND
SW
COMP
FB
9
GND
SOP-8 (Exposed Pad)
Typical Application Circuit
1
3
2
7
V
IN
VIN
BOOT
RT8272
C
10µF
4.75V to 24V
C
IN
BOOT
L
10nF 4.7µH
V
OUT
SW
Chip Enable
3.3V/3A
D1
EN
SS
R1
B330
25.8k
C
8
OUT
5
6
FB
47µF
C
SS
4,
C
C
R
C
0.1µF
R2
2.2nF 39k
9 (Exposed Pad)
10k
GND
COMP
C
P
NC
DS8272-02 March 2011
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
